Interplanetary: Steam price vs key
Interplanetary is no longer for sale on the Steam Store, but its keys still work: BuyCheapKeys has it for €3.15 and it activates on your Steam account like any other game (checked on October 3, 2026).
- Instant deliveryKey by email and in your account
- Full guaranteeReplacement or refund
- Secure paymentCard, PayPal, Google Pay, Apple Pay
- Activates on SteamSame game in your library
- Up to 4% cashbackWith the VIP Club
Should I buy Interplanetary now? The only way to get it
Since it's no longer sold on Steam, a key is how you add it to your library.
Price score: 8/10
The same game, for less
A Steam key gives you exactly the same as buying on Steam. Only the price changes.
Available Interplanetary keys
1 offer, sorted by price
- €3.15Buy
Interplanetary
CheapestSteam keyGlobal
Interplanetary price history
- BuyCheapKeys key€3.15
We've been tracking this game since October 3, 2026. The chart will appear once there are a few days of data.
How to activate the Interplanetary key
- 1
Buy the key
Choose the Interplanetary offer and pay. You get the key instantly.
- 2
Open Steam
Go to “Games” › “Activate a Product on Steam”.
- 3
Redeem and play
Paste the key and the game stays in your library forever.
Interplanetary FAQ
›How much is Interplanetary on Steam?
Interplanetary isn't for sale on the Steam Store, so it has no official price. At BuyCheapKeys the Steam key costs €3.15.
›Where to buy Interplanetary cheapest?
The cheapest option is the BuyCheapKeys Steam key for €3.15. Instant delivery and it activates on Steam.
›Is the Interplanetary key the same game as on Steam?
Yes. When you redeem the key, Interplanetary is added to your Steam account with achievements, cloud saves and updates, just as if you bought it on Steam.
›What is the lowest price for Interplanetary at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €3.15 (October 3, 2026). Today it costs €3.15.
›Will the Interplanetary key work in my country?
We list Global and Europe region keys. Each BuyCheapKeys product page tells you whether it can be activated in your country before you buy.
›Is it safe to buy from BuyCheapKeys?
Yes. Delivery is instant by email and in your account, we accept card, PayPal, Google Pay and Apple Pay, and every purchase is covered by a replacement or refund guarantee.
›Does Interplanetary work on Steam Deck?
Valve rates it “Playable” on Steam Deck. Once the key is activated on Steam you can play it on Steam Deck just like on PC.
›Is Interplanetary worth it?
It has 78% positive reviews out of 805 on Steam (“Mostly Positive”), was released in 2015 and is developed by Team Jolly Roger. Genres: Strategy, Indie, Space, Turn-Based Strategy.
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Interplanetary
€3.15